Institution: | a Centre Lorrain d'Optique et Electronique des Solides, Université de Metz et Supélec, Technopôle de Metz 2000, 2 Rue Edouard Belin, 57078, Metz Cedex 3, France b Institute of Physics, Silesian University, ul. Uniwersytecka 4, 40-007, Katowice, Poland |
Abstract: | Raman scattering investigations of lead-barium zirconate are presented for two barium concentrations, as a function of temperature from 10 to 450 K. An order-disorder phase transition is observed at 130 K for the low barium concentration, for which an antiferroelectric-ferroelectric phase transition is equally observed at 308 K and a ferroelectric-paraelectric one at 433 K. The ceramic containing a high barium concentration is in a ferroelectric state up to 403 K, above this temperature begins the paraelectric phase of the material. The order parameters of the two types of transitions, order-disorder and antiferroelectric-ferroelectric, are evaluated. |